A method and system provides connections to an ATM system and includes selective echo cancellation. The invention includes two interworking units, an echo canceller, and a signaling processor. The signaling processor receives and processes signaling to provide connection control instructions to the interworking units. The first interworking unit will accept a connection, and if the connection does not require echo cancellation, interwork the incoming connection with an ATM connection to the ATM system. If the incoming connection requires echo cancellation, the first interworking unit will interwork the incoming connection with an ATM connection to the second interworking unit. The second interworking unit will interwork the ATM connection with another connection to echo cancellation. After echo cancellation, the second interworking unit will interwork the connection from echo cancellation with another ATM connection to the ATM system.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method of operating a communication system comprising: receiving a first Time Division Multiplex (TDM) communication and a first signaling message; processing the first signaling message to determine if echo cancellation is required; if echo cancellation is required, selecting a first identifier and a second identifier; converting the first TDM communication into a first asynchronous communication with the first identifier; routing the first asynchronous communication to an echo canceller based on the first identifier; converting the first asynchronous communication into a second TDM communication; canceling echo from the second TDM communication; after canceling the echo, converting the second TDM communication into a second asynchronous communication with the second identifier; and routing the second asynchronous communication based on the second identifier.
2. The method of claim 1 wherein the first signaling message comprises an initial address message.
3. The method of claim 1 wherein the first TDM communication is from a DS 0 connection.
4. The method of claim 1 wherein the first asynchronous communication comprises an asynchronous transfer mode communication and the first identifier comprises an asynchronous transfer mode identifier.
5. The method of claim 1 further comprising generating and transmitting a second signaling message indicating the second identifier.
6. The method of claim 5 wherein the second signaling message comprises an initial address message.
7. A method of operating a communication system comprising: receiving a first signaling message and a first asynchronous communication with a first identifier; processing the first signaling message to determine if echo cancellation is required; if echo cancellation is required, selecting a second identifier, a third identifier, and a first TDM connection; converting the first asynchronous communication into a second asynchronous communication with the second identifier; routing the second asynchronous communication to an echo canceller based on the second identifier; converting the second asynchronous communication into a first TDM communication; canceling echo from the first TDM communication; after canceling the echo, converting the first TDM communication into a third asynchronous communication with the third identifier; routing the third asynchronous communication to an interworking unit based on the third identifier; converting the third asynchronous communication into a second TDM communication; and routing the second TDM communication over the first TDM connection.
8. The method of claim 7 wherein the first signaling message comprises an initial address message.
9. The method of claim 7 wherein the first TDM connection comprises a DS 0 connection.
10. The method of claim 7 wherein the second asynchronous communication comprises an asynchronous transfer mode communication and the second identifier comprises an asynchronous transfer mode identifier.
11. The method of claim 7 further comprising generating and transmitting a second signaling message indicating the DS 0 connection.
12. The method of claim 11 wherein the second signaling message comprises an initial address message.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
April 11, 2000
January 6, 2004
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